Chalcedony. A semi-treasured gemstone named after the close by town of Chalcedon, and is also sold in most of Istanbul's large number of jewellery outlets. Nowadays, most metro stations would not have a staffed ticket booth, so you will have to receive your Istanbulkart from the yellow ticket equipment. By https://trevorasgqb.elbloglibre.com/37031456/istanbul-personal-portfolio-wordpress-theme-fundamentals-explained